Squaring Numbers
Multiplying Numbers
Dividing Numbers
 any by 0.125
 2 digits by 1 1/9
 2 digits by 1 1/8
 2 digits by 1 1/7
 2 digits by 1 1/6
 2 digits by 1 1/5
 2 digits by 1 1/4
 2 digits by 1 2/7
 2 digits by 1 1/3
 2 digits by 1 2/5
 2 digits by 1 3/7
 2 digits by 1 1/2
 2 digits by 1 3/5
 2 digits by 1 2/3
 2 digits by 1 3/4
 2 digits by 1 4/5
 2 digits by 2 2/9
 2 digits by 2 1/4
 2 digits by 2 1/3
 2,3 digits by 2 1/2
 2 digits by 2 2/3
 2 digits by 2 6/7
 2 digits by 3 1/8
 2,3 digits by 3 1/3
 2 digits by 3 1/2
 2 digits by 3 4/7
 2 digits by 4 1/6
 2 digits by 4 2/7
 2 digits by 4 4/9
 2 digits by 4 1/2
 2 digits by 5
 2 digits by 5 5/7
 2 digits by 6 1/4
 2 digits by 6 2/3
 2 digits by 7 1/7
 2 digits by 7 1/2
 2 digits by 8 1/3
 2 digits by 8 4/7
 2 digits by 12 1/2
 2 digits by 15
 2,3 digits by 16 2/3
 2,3 digits by 25
 2,3 digits by 33 1/3
 2,3 digits by 35
 2 digits by 37 1/2
 2 digits by 40
 2 digits by 45
 2 digits by 50
 2 digits by 62 1/2
 2 digits by 66 2/3
 2,3 digits by 75
 2 digits by 83 1/3
 2 digits by 87 1/2
 2 digits by 125
 2 digits by 166 2/3
 2 digits by 250
 2,3 digits by 333 1/3
 2 digits by 375
 2 digits by 625
 2 digits by 875
 3 digits rep./37+41
 6 digits rep. by 15873
 6 digits rep. by 7, then 13
 6 digits rep. by 13, then 11
 6 digits rep. by 7,11,13, subtract 101
 6 digits rep. by 37037 x 5
 mixed numbers by 2
 diff. of squares of 2 consec. 2digit numbers
 diff. of squares of 2 different 2digit numbers
 sqrt of squares of 2digit numbers ending in 1
 sqrt of perfect squares ending in 5
Adding Numbers
Subtracting Numbers
Finding Percents
Calculation
Practice Exercises
Full List

Dividing a repeating 6digit number by 7,
then
by 13
 Select a 3digit number.
 Repeat these digits to make a 6digit number.
 Divide these 6 digits by 7, then by 13.
 The answer is 11 times the first three digits!
Example:
 If the 3digit number selected is 234:
 The 6digit number is 234234.
 Divide by 7, then by 13: multiply by 11
 to multiply 234 by 11, work right to left:
last digit on right = _ _ _ 4
next digit to left = 3 + 4 = 7: _ _ 7 _
next digit to left = 2 + 3 = 5: _ 5 _ _
last digit on left = 2 _ _ _
 So 234234 divided by 7, then 13 is 2574.
See the pattern?
 If the 3digit number selected is 461:
 The 6digit number is 461461.
 Divide by 7, then by 13: multiply by 11
 to multiply 461 by 11, work right to left:
last digit on right = _ _ _ 1
next digit to left = 6 + 1 = 7: _ _ 7 _
next digit to left = 4 + 6 = 10: _ 0 _ _
last digit on left = 4 + 1(carry) = 5: 5 _ _ _
 So 461461 divided by 7, then 13 is 5071.
Practice multiplying by 11  this process works for multiplying any number by
11.
